Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 817 [Rate centres in NPA 817] [Dial plan for NPA 817]

NXX: 409

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
817-409 A Alvarado TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
817-409 0 Alvarado TX   515J IP HORIZON LLC 552   2017-12-15   
817-409 1 Alvarado TX   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2005-03-24   
817-409 2 Alvarado TX   624H ONVOY SPECTRUM, LLC 552   2021-12-02   
817-409 3 Alvarado TX   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2007-02-16   
817-409 4 Alvarado TX   903C ONVOY, LLC - TX 552   2014-10-03   
817-409 5 Alvarado TX   508J CENTURYLINK COMMUNICATIONS, LLC 552   2014-05-14   
817-409 6 Alvarado TX   903C ONVOY, LLC - TX 552   2014-10-03   
817-409 7 Alvarado TX   903C ONVOY, LLC - TX 552   2011-11-25   
817-409 8 Alvarado TX   903C ONVOY, LLC - TX 552   2020-05-18   
817-409 9 Alvarado TX   903C ONVOY, LLC - TX 552   2010-11-08   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.